If your going to have an aftermarket ECU then you can run the coilpacks directly from your ignition output. The left over base of the distributor under the blanking cover will give it the crank angle position.
You might not even need a donor loom, I almost have enough EFI plugs to make a complete harness from new. I don't have the crank angle or Injector yet but I have most of the others.
Have you decided which ECU you will use yet?